Hot fluid gun



NOV. 26, F CARSWELL ET AL n HOT FLUID GUN Filed Dec. 10, 1932 2 y@ 5g 64 4f 2a .f6 9

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/2 Ja /4 Je l d INVENTORS, /wzaw Z. ff/rei] l ATTORNEY` Patented Nov. 26, 1935 UNITED STATES PATENT OFFICE HOT FLUID GUN Firman L. Carswell and Otto Schmidt, Kansas City, Mo.

Application December 10, 1932, Serial No. 646,602

8 Claims.

' primary object of the invention is the contemplation of unique and specially formed parts, whereby to create a hot fluid gun that will effectually and positively raise the temperature of fluid without working a destructive force upon any part of the assembly.

One of the important aims to this invention is the provision of a hot fluid gun, having as a part thereof, specially formed and positioned fluid tubes and passages, and unique positive means for causing the heating element of the gun to act so long as fluid of apredetermined pressure is passing through the gun.

Since many of the more important objects of the invention lie in the combination and formation of the parts of the fluid gun, it remains to make clear these objects during the course of the following specification, referring to the accompanying drawing, wherein:

Figure 1 is a longitudinal sectional view through a fluid gun embodying this invention.

Fig. 2 is a cross section through the same, taken on line II-II of Fig. l, and,

Fig. 3 is a cross section through the gun, taken on line III- III of Fig. 1.

Fluid handling equipment illustrated in the accompanying drawing may be used in forcing grease from differentials, crank cases or similar housings, and is especially useful when the grease has become hard or, as a result of low temperatures, the grease or oil has congealed to a point Where removal becomes difficult unless heat is applied.

This gun might also be used in heating oil in the crank cases of airplane engines prior to starting and, in fact, the gun may be used wherever it is desired to bring into play a steady, constant flow of hot fluid under pressure.

Parts making up the fluid gun are assembled in such a manner that the heat unit acts directly upon fluid passing through the gun without creating a destructive force upon any part of the apparatus. The gun should be costructed to present an insulated casing 6 that is substantially closed at each end by suitably cast headers 8 and I8. Header IIJ has an intake port I2 formed therein which extends from boss I4 to compartment 36. A fixture I8, in screw-threaded engagement with boss I4, may be used to clamp the air hose end 20 in position to supply a constant flow of air under pressure. Thumb screw 22 may be moved to position to hold hose end 28 in place, as shown in Fig. 1. Y

It is desirable to control the flow of fluid through intake port I2, and to accomplish this aim, an adjustable control valve 24 is provided which may 5 be moved to alter the effective size of intake port I2 at a point where seat 26 is created. Valve 24 terminates in the form of a conical end 28, and when valve 24 is moved against seat 25, the only Way left for fluid to pass into tube I6 is through 10 by-pass 30 that interconnects intake port I2 at each side of seat 26. In this manner a predetermined minimum amount of air or other fluid always passes through the gun regardless of the position of valve 24 when air hose 20 is in place. 15

A U-shaped heating element 32 is employed and should be so circumscribed by ovoid tube I6 that a spaced relation with heating element 32 is established, as shown in Fig. 2. A transverse partition 34 adjacent one end of casing 6 forms 20 compartment 36, and it is upon this partition 34 of insulating material that a suitable electrical switch is mounted to control the flow of current to element 32. Switch points 38 are spaced apart and when these points are bridged, the circuit 25 is closed and the heating element functions.

It is desirable not to have heating element 32 act unless liuid is passing through tube I6. To automatically fulll this requirement, therefore, intake port I2 has positioned therein a valve 30 member 48 which is yieldably maintained in an intake port closing position by a spring 42. Valve member 40 is much like a piston and when air or fluid strikes the top of the same, it is moved against the action of spring 42 to a point where 35 intake port I2 is unobstructed. Intake port I2 is formed to have portions meeting at right angles and, as a result, member 40 may function as illustrated in Fig. 1. Air of a predetermined pressure will move member 40 to open that part of 40 the intake port I2 which is in axial alignment with valve 24, and when such pressure is maintained, and at all times during the flow of air under that pressure through intake port I2, spring 42 will be compressed and switch points 45 38 will be closed by stud 44 which is moved thereagainst when valve member 40 moves to open intake port I2.

A passage 46 formed through partition 34 allows the escape of air to the interior of tube 50 I6 from compartment 36 and opening 48 will, in turn, permit the air to pass into connections 52 and 54. Suitable connections 52 and 54 are attached to header 8 in communication with tube I6 through the medium of opening 48, and 55 a constant flow of fluid under pressure will be heated when it passes through tube I6. Each end of tube i6 is ared outwardly to meet; the inner wall of casing 6, as shown in Figs. l and 2. Each of headers 8 and l0 respectively has radial lugs 5G and 58 respectively formed integrally therewith and between these radially extending lugs there is positioned a jacket 60 which is spaced apart from casing 6 so that a chamber is formed. Air may freely circulate in this chamber by passing longitudinally through jacket 6U. Tie bars S4 hold headers 8 and I0 in place and one of said tie bars is angled outwardly, as shown in Figs. l and 2, to support a handle 66 that may be grasped by the user as the fluid gun is being moved to and from engagement with its work.

Obviously, a cord 68 is used in combination with switch points 38 to complete the means for supplying current to heater 32, and since all of the parts of the gun are thoroughly cooled and ventilated where necessary, it becomes obvious that no destructive heat can be transmitted from element to any part of the gun whatsoever. Tube lli may be inade of any suitable metal, and since the saine is formed in the fashion shown and described, it is obvious that an especially is absorbed by fluid passing `e outlet opening 48 oi header 8 Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent is:

i. A hot fluid gun comprising a casing having an inlet port and an outlet port formed therethrough; a tube extending from the inlet port to the outlet port within the casing; an electrical heating element within the tube having si ch connection to a source of electrical energy; and ineens, operable by the passage of fluid through said inlet port, for closing and main- `taining the said switch connection in condition to furnish energy to said heating element, said tube being spaced from the casing to form an air receiving chamber between the tube and castube being in communication with the inlet and outlet port to convey air from the former to the latter, the said chamber being closed at each end thereof, whereby to form a dead air space additionally insulating the said iin-US.

gun comprising a casing having i and an outlet port formed thereelectrical heating element within sT-.fich to control the flow of curt, a valve member disposed t and movable from a posirt to a position opening the d passing through the said carried by the said valve h when the former on, said valve memhin the casing; an electri- -t circumscribed by the tube; ti nel the flow of current to said t a valve member disposed within the inlet port and movable from a position closing aoerees said port to a position opening the same by the action of fluid passing through said inlet port; and means carried by said valve member for closing said switch when the former is in the port opening position.

4. A hot fluid gun comprising a casing having an inlet port and an outlet port formed therethrough; a tube extending from the inlet port to the outlet port Within the casing; an electrical heating element circumscribed by the tube; a switch to control the flow of current to said element; a' valve member disposed within the inlet port and movable from a position closing said port to a position opening the same by the action of fluid passing through said inlet port; a spring to urge said valve member toward the port closing position against the action of the fluid passing through the inlet port; and means carried by said valve member for closing said switch when the former is moved to the port opening position by a flow of uid through said inlet port of sufficient intensity to overcome and compress the said spring.

5. A hot huid gun comprising a casing; a tube within the casing; an electrical heating element within the casing and circumscribed by the said tube; an apertured partition transversely of the casing and setting or a compartment at one end thereof; and an automatic fluid controlled switch houser in the compartment for controlling the new of current to said heating element, said switch being held in the closed position by fluid passing to said tube through the aperture of the partition.

A hot fluid gun comprising a casing; a header at each end of said casing; an inlet port formed through one oi said headers; an outlet port formed through the other of said headers; a within the casing and connecting said inlet and outlet ports; a heater circumscribed by the tube to heat duid as it passes through the latter; and an adjustable control valve to vary the effective size of the said inlet port.

7. A hot iluid gun comprising a casing; a header at each end of said casing; an inlet port formed through one or said headers; an outlet por formed through the other of said headers; eJ tube within the casing and connecting said inlet and outlet ports; a heater circumscribed by the tube to heat fluid as it passes through the i" latter; an adjustable control valve to vary the effective size of the said inlet port; and a by-pass formed by the header, connecting points on each side of said control valve whereby when the valve is closed a passage of air is permitted through the said inlet port by way of said by-pass.

8. A hot fluid gun comprising a casing having an inlet port and an outlet port; an electrical heating element intermediate the said inlet port and outlet port to heat the fluid as it passes from the former to the latter; a switch to control the fiow of current to said element; and means, mounted in the inlet port for rectilinear reciprocation movable to one end of its path of travel by the passage of duid through the said casing, for closing and maintaining the said switch in a circuit closing position there being a spring for returning the said means to the other end of its path of travel when the flow of fluid is stopped.

FIRMAN L. CARSVVELL. OTTO W. SCHMIDT. 

